EFT strings and emergence

A bstract We revisit the Emergence Proposal in 4d $$ \mathcal{N} N = 2 vector multiplet sectors that arise from type II string Calabi-Yau compactifications, with emphasis on role of axionic fundamental strings, or EFT strings. focus large-volume IIA where strings NS5-branes wrapping internal four-cycles, and consider a set infinite-distance moduli-space limits can be classified terms scaling weight w 1 , 3. It has been shown before how one-loop threshold effects an infinite tower BPS particles made up D2/D0-branes generate asymptotic behaviour gauge kinetic functions along extend this result to limits, by taking into account D2-brane multi-wrapping numbers. In leading involves oscillations, one reproduce both weakly strongly-coupled U(1)’s independently whether is critical not, assuming charged modes dominate light spectrum.